EP 0926181 A2 19990630 - Manufacturing method for polycarbonate
Title (en)
Manufacturing method for polycarbonate
Title (de)
Produktionsverfahren für Polycarbonat
Title (fr)
Procédé de fabrication de polycarbonate
Publication
Application
Priority
JP 36123897 A 19971226
Abstract (en)
A method for manufacturing polycarbonate by melt-polycondensing bisphenol and carbonic acid diester uses as catalyst an alkali metal compound and/or alkaline earth metal compound (a). The catalyst is added to the bisphenol prior to the melt polycondensation. in an effective amount, i.e., the amount of alkali metal compound and/or alkaline earth metal compound (a) that acts effectively as a catalyst, is contained in said bisphenol, and is controlled to have the same catalytic activity as 1 x 10<-8> to 1 x 10<-6> mole of bisphenol disodium salt per mole of pure bisphenol A. The method conducts the reaction efficiently from the initial stage in a stable manner to obtain polycarbonate with good color, good heat stability and color stability during molding and the like.
IPC 1-7
IPC 8 full level
C08F 2/00 (2006.01); C08G 64/30 (2006.01)
CPC (source: EP KR US)
C08G 64/20 (2013.01 - KR); C08G 64/30 (2013.01 - KR); C08G 64/307 (2013.01 - EP KR US); C08K 5/58 (2013.01 - KR)
Designated contracting state (EPC)
BE DE ES FR GB IT NL
DOCDB simple family (publication)
EP 0926181 A2 19990630; EP 0926181 A3 19990728; EP 0926181 B1 20040317; CN 1124301 C 20031015; CN 1225926 A 19990818; DE 69822424 D1 20040422; DE 69822424 T2 20050217; JP 3681529 B2 20050810; JP H11189643 A 19990713; KR 100641517 B1 20061219; KR 19990063538 A 19990726; TW 523527 B 20030311; US 2002037838 A1 20020328; US 6635710 B2 20031021
DOCDB simple family (application)
EP 98310179 A 19981211; CN 98124095 A 19981216; DE 69822424 T 19981211; JP 36123897 A 19971226; KR 19980059730 A 19981224; TW 87121624 A 19981224; US 20835698 A 19981210